drivers/iio/pressure/st_pressure_core.c

   1 /*
   2  * STMicroelectronics pressures driver
   3  *
   4  * Copyright 2013 STMicroelectronics Inc.
   5  *
   6  * Denis Ciocca <denis.ciocca@st.com>
   7  *
   8  * Licensed under the GPL-2.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/errno.h>
  15 #include <linux/types.h>
  16 #include <linux/mutex.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/i2c.h>
  19 #include <linux/gpio.h>
  20 #include <linux/irq.h>
  21 #include <linux/delay.h>
  22 #include <linux/iio/iio.h>
  23 #include <linux/iio/sysfs.h>
  24 #include <linux/iio/trigger.h>
  25 #include <linux/iio/buffer.h>
  26 #include <asm/unaligned.h>
  27
  28 #include <linux/iio/common/st_sensors.h>
  29 #include "st_pressure.h"
  30
  31 #define ST_PRESS_LSB_PER_MBAR                   4096UL
  32 #define ST_PRESS_KPASCAL_NANO_SCALE             (100000000UL / \
  33                                                  ST_PRESS_LSB_PER_MBAR)
  34 #define ST_PRESS_LSB_PER_CELSIUS                480UL
  35 #define ST_PRESS_CELSIUS_NANO_SCALE             (1000000000UL / \
  36                                                  ST_PRESS_LSB_PER_CELSIUS)
  37 #define ST_PRESS_NUMBER_DATA_CHANNELS           1
  38
  39 /* FULLSCALE */
  40 #define ST_PRESS_FS_AVL_1260MB                  1260
  41
  42 /* CUSTOM VALUES FOR LPS331AP SENSOR */
  43 #define ST_PRESS_LPS331AP_WAI_EXP               0xbb
  44 #define ST_PRESS_LPS331AP_ODR_ADDR              0x20
  45 #define ST_PRESS_LPS331AP_ODR_MASK              0x70
  46 #define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL       0x01
  47 #define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL       0x05
  48 #define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL      0x06
  49 #define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL      0x07
  50 #define ST_PRESS_LPS331AP_PW_ADDR               0x20
  51 #define ST_PRESS_LPS331AP_PW_MASK               0x80
  52 #define ST_PRESS_LPS331AP_FS_ADDR               0x23
  53 #define ST_PRESS_LPS331AP_FS_MASK               0x30
  54 #define ST_PRESS_LPS331AP_FS_AVL_1260_VAL       0x00
  55 #define ST_PRESS_LPS331AP_FS_AVL_1260_GAIN      ST_PRESS_KPASCAL_NANO_SCALE
  56 #define ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN      ST_PRESS_CELSIUS_NANO_SCALE
  57 #define ST_PRESS_LPS331AP_BDU_ADDR              0x20
  58 #define ST_PRESS_LPS331AP_BDU_MASK              0x04
  59 #define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR         0x22
  60 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK    0x04
  61 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK    0x20
  62 #define ST_PRESS_LPS331AP_MULTIREAD_BIT         true
  63 #define ST_PRESS_LPS331AP_TEMP_OFFSET           42500
  64 #define ST_PRESS_LPS331AP_OUT_XL_ADDR           0x28
  65 #define ST_TEMP_LPS331AP_OUT_L_ADDR             0x2b
  66
  67 static const struct iio_chan_spec st_press_lps331ap_channels[] = {
  68         {
  69                 .type = IIO_PRESSURE,
  70                 .channel2 = IIO_NO_MOD,
  71                 .address = ST_PRESS_LPS331AP_OUT_XL_ADDR,
  72                 .scan_index = ST_SENSORS_SCAN_X,
  73                 .scan_type = {
  74                         .sign = 'u',
  75                         .realbits = 24,
  76                         .storagebits = 24,
  77                         .endianness = IIO_LE,
  78                 },
  79                 .info_mask_separate =
  80                         BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  81                 .modified = 0,
  82         },
  83         {
  84                 .type = IIO_TEMP,
  85                 .channel2 = IIO_NO_MOD,
  86                 .address = ST_TEMP_LPS331AP_OUT_L_ADDR,
  87                 .scan_index = -1,
  88                 .scan_type = {
  89                         .sign = 'u',
  90                         .realbits = 16,
  91                         .storagebits = 16,
  92                         .endianness = IIO_LE,
  93                 },
  94                 .info_mask_separate =
  95                         BIT(IIO_CHAN_INFO_RAW) |
  96                         BIT(IIO_CHAN_INFO_SCALE) |
  97                         BIT(IIO_CHAN_INFO_OFFSET),
  98                 .modified = 0,
  99         },
 100         IIO_CHAN_SOFT_TIMESTAMP(1)
 101 };
 102
 103 static const struct st_sensors st_press_sensors[] = {
 104         {
 105                 .wai = ST_PRESS_LPS331AP_WAI_EXP,
 106                 .sensors_supported = {
 107                         [0] = LPS331AP_PRESS_DEV_NAME,
 108                 },
 109                 .ch = (struct iio_chan_spec *)st_press_lps331ap_channels,
 110                 .odr = {
 111                         .addr = ST_PRESS_LPS331AP_ODR_ADDR,
 112                         .mask = ST_PRESS_LPS331AP_ODR_MASK,
 113                         .odr_avl = {
 114                                 { 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, },
 115                                 { 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, },
 116                                 { 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, },
 117                                 { 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, },
 118                         },
 119                 },
 120                 .pw = {
 121                         .addr = ST_PRESS_LPS331AP_PW_ADDR,
 122                         .mask = ST_PRESS_LPS331AP_PW_MASK,
 123                         .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
 124                         .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
 125                 },
 126                 .fs = {
 127                         .addr = ST_PRESS_LPS331AP_FS_ADDR,
 128                         .mask = ST_PRESS_LPS331AP_FS_MASK,
 129                         .fs_avl = {
 130                                 [0] = {
 131                                         .num = ST_PRESS_FS_AVL_1260MB,
 132                                         .value = ST_PRESS_LPS331AP_FS_AVL_1260_VAL,
 133                                         .gain = ST_PRESS_LPS331AP_FS_AVL_1260_GAIN,
 134                                         .gain2 = ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN,
 135                                 },
 136                         },
 137                 },
 138                 .bdu = {
 139                         .addr = ST_PRESS_LPS331AP_BDU_ADDR,
 140                         .mask = ST_PRESS_LPS331AP_BDU_MASK,
 141                 },
 142                 .drdy_irq = {
 143                         .addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR,
 144                         .mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK,
 145                         .mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK,
 146                 },
 147                 .multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT,
 148                 .bootime = 2,
 149         },
 150 };
 151
 152 static int st_press_read_raw(struct iio_dev *indio_dev,
 153                         struct iio_chan_spec const *ch, int *val,
 154                                                         int *val2, long mask)
 155 {
 156         int err;
 157         struct st_sensor_data *pdata = iio_priv(indio_dev);
 158
 159         switch (mask) {
 160         case IIO_CHAN_INFO_RAW:
 161                 err = st_sensors_read_info_raw(indio_dev, ch, val);
 162                 if (err < 0)
 163                         goto read_error;
 164
 165                 return IIO_VAL_INT;
 166         case IIO_CHAN_INFO_SCALE:
 167                 *val = 0;
 168
 169                 switch (ch->type) {
 170                 case IIO_PRESSURE:
 171                         *val2 = pdata->current_fullscale->gain;
 172                         break;
 173                 case IIO_TEMP:
 174                         *val2 = pdata->current_fullscale->gain2;
 175                         break;
 176                 default:
 177                         err = -EINVAL;
 178                         goto read_error;
 179                 }
 180
 181                 return IIO_VAL_INT_PLUS_NANO;
 182         case IIO_CHAN_INFO_OFFSET:
 183                 switch (ch->type) {
 184                 case IIO_TEMP:
 185                         *val = 425;
 186                         *val2 = 10;
 187                         break;
 188                 default:
 189                         err = -EINVAL;
 190                         goto read_error;
 191                 }
 192
 193                 return IIO_VAL_FRACTIONAL;
 194         default:
 195                 return -EINVAL;
 196         }
 197
 198 read_error:
 199         return err;
 200 }
 201
 202 static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
 203 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
 204
 205 static struct attribute *st_press_attributes[] = {
 206         &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 207         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 208         NULL,
 209 };
 210
 211 static const struct attribute_group st_press_attribute_group = {
 212         .attrs = st_press_attributes,
 213 };
 214
 215 static const struct iio_info press_info = {
 216         .driver_module = THIS_MODULE,
 217         .attrs = &st_press_attribute_group,
 218         .read_raw = &st_press_read_raw,
 219 };
 220
 221 #ifdef CONFIG_IIO_TRIGGER
 222 static const struct iio_trigger_ops st_press_trigger_ops = {
 223         .owner = THIS_MODULE,
 224         .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
 225 };
 226 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
 227 #else
 228 #define ST_PRESS_TRIGGER_OPS NULL
 229 #endif
 230
 231 int st_press_common_probe(struct iio_dev *indio_dev,
 232                                 struct st_sensors_platform_data *plat_data)
 233 {
 234         int err;
 235         struct st_sensor_data *pdata = iio_priv(indio_dev);
 236
 237         indio_dev->modes = INDIO_DIRECT_MODE;
 238         indio_dev->info = &press_info;
 239
 240         err = st_sensors_check_device_support(indio_dev,
 241                                 ARRAY_SIZE(st_press_sensors), st_press_sensors);
 242         if (err < 0)
 243                 goto st_press_common_probe_error;
 244
 245         pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
 246         pdata->multiread_bit = pdata->sensor->multi_read_bit;
 247         indio_dev->channels = pdata->sensor->ch;
 248         indio_dev->num_channels = ARRAY_SIZE(st_press_lps331ap_channels);
 249
 250         if (pdata->sensor->fs.addr != 0)
 251                 pdata->current_fullscale = (struct st_sensor_fullscale_avl *)
 252                         &pdata->sensor->fs.fs_avl[0];
 253
 254         pdata->odr = pdata->sensor->odr.odr_avl[0].hz;
 255
 256         if (!plat_data)
 257                 plat_data =
 258                         (struct st_sensors_platform_data *)&default_press_pdata;
 259
 260         err = st_sensors_init_sensor(indio_dev, plat_data);
 261         if (err < 0)
 262                 goto st_press_common_probe_error;
 263
 264         if (pdata->get_irq_data_ready(indio_dev) > 0) {
 265                 err = st_press_allocate_ring(indio_dev);
 266                 if (err < 0)
 267                         goto st_press_common_probe_error;
 268
 269                 err = st_sensors_allocate_trigger(indio_dev,
 270                                                         ST_PRESS_TRIGGER_OPS);
 271                 if (err < 0)
 272                         goto st_press_probe_trigger_error;
 273         }
 274
 275         err = iio_device_register(indio_dev);
 276         if (err)
 277                 goto st_press_device_register_error;
 278
 279         return err;
 280
 281 st_press_device_register_error:
 282         if (pdata->get_irq_data_ready(indio_dev) > 0)
 283                 st_sensors_deallocate_trigger(indio_dev);
 284 st_press_probe_trigger_error:
 285         if (pdata->get_irq_data_ready(indio_dev) > 0)
 286                 st_press_deallocate_ring(indio_dev);
 287 st_press_common_probe_error:
 288         return err;
 289 }
 290 EXPORT_SYMBOL(st_press_common_probe);
 291
 292 void st_press_common_remove(struct iio_dev *indio_dev)
 293 {
 294         struct st_sensor_data *pdata = iio_priv(indio_dev);
 295
 296         iio_device_unregister(indio_dev);
 297         if (pdata->get_irq_data_ready(indio_dev) > 0) {
 298                 st_sensors_deallocate_trigger(indio_dev);
 299                 st_press_deallocate_ring(indio_dev);
 300         }
 301 }
 302 EXPORT_SYMBOL(st_press_common_remove);
 303
 304 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 305 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
 306 MODULE_LICENSE("GPL v2");